20445379 has 4 divisors (see below), whose sum is σ = 20466576. Its totient is φ = 20424184.

The previous prime is 20445361. The next prime is 20445427. The reversal of 20445379 is 97354402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20445379 - 2⁹ = 20444867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9079 + ... + 11104.

It is an arithmetic number, because the mean of its divisors is an integer number (5116644).

Almost surely, 2^20445379 is an apocalyptic number.

20445379 is a deficient number, since it is larger than the sum of its proper divisors (21197).

20445379 is a wasteful number, since it uses less digits than its factorization.

20445379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21196.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20445379 is about 4521.6566654270. The cubic root of 20445379 is about 273.4418950412.

The spelling of 20445379 in words is "twenty million, four hundred forty-five thousand, three hundred seventy-nine".